Killaarak is a demon who enjoys watching a turncoat go through life. If it's a Fighter going to the dark side, he'll be watching. If a Paladin is becoming a Blackguard, Killaarak will dance with joy! Sometimes, if someone is on the edge, Killaarak will invade their mind and give them a helpful little shove into darkness. At one point, he attempetd to corrupt the same knight that carried the blade the lesser deity of warriors Kusunoroi was trapped in. Luckily for the knight, the blade had been infused with the dragon's power and he was able to fight off the demon, mentally, and physically, slicing off one of Killaraak's horns in the process.. Since then Killaarak has always chosen his targets carefully, studying them for a day before invading their minds.

Killaarak cannot stand ANY law-abidingness from his followers. If a follower of Killaarak abides by a law, they suddenly die of unkown cause. Yet, if they cause as much trouble as they can, and get more people to cause trouble, Killaarak rewards them by coming from the plane of the abyss and imbuing their weapon with chaotic properties.